"The Trending 20" is a regular series where we round up interesting, informative and hilarious tweets from worldwide Twitter trending topics, fueled by young tweeters on the interwebs. Have one to submit? Give us a shout @HuffPostTeen.
Yesterday evening, students from across the Twitterverse shared some of their most hilarious -- and frustrating -- classroom moments, propelling #QuoteYourTeacher to trend number-one worldwide. Using the hashtag, teens shared some universally relatable quotes from their teachers ("Why are you packing up already? The bell rings in 10 seconds") and sayings from their favorite fictional professors ("Turn to page 394..."). Click through the slideshow below for 20 of our favorite #TeacherQuotes, and tell us: Which of these quotes do you hear most from your teachers? Share your thoughts in the comments or tweet @HuffPostTeen!